CN100383682C - Electrophotographic printer - Google Patents
Electrophotographic printer Download PDFInfo
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- CN100383682C CN100383682C CNB2004100621446A CN200410062144A CN100383682C CN 100383682 C CN100383682 C CN 100383682C CN B2004100621446 A CNB2004100621446 A CN B2004100621446A CN 200410062144 A CN200410062144 A CN 200410062144A CN 100383682 C CN100383682 C CN 100383682C
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- photosensitive drums
- developing cell
- lens
- electrophotographic printer
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- 239000003086 colorant Substances 0.000 claims 1
- 238000007639 printing Methods 0.000 description 15
- 230000002093 peripheral effect Effects 0.000 description 14
- 230000014509 gene expression Effects 0.000 description 10
- 238000009434 installation Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 238000004140 cleaning Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000000354 decomposition reaction Methods 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 238000007373 indentation Methods 0.000 description 2
- 230000002452 interceptive effect Effects 0.000 description 2
- 238000010023 transfer printing Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
- G03G21/06—Eliminating residual charges from a reusable imaging member
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G2215/00—Apparatus for electrophotographic processes
- G03G2215/04—Arrangements for exposing and producing an image
- G03G2215/0429—Changing or enhancing the image
- G03G2215/0431—Producing a clean non-image area, i.e. avoiding show-around effects
- G03G2215/0448—Charge-erasing means for the non-image area
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
- Electrophotography Configuration And Component (AREA)
- Color Electrophotography (AREA)
Abstract
An electrophotographic printer including a pre-erasing unit. The pre-erasing unit includes a pre-erasing lamp to irradiate light, and a pre-transfer erasing lens to induce the light generated from the pre-transfer erasing lamp to the photosensitive drum, movably installed such that it moves to an erasure position at which the pre-transfer erasing lens is close to the photosensitive drum for erasure, and moves to a retracted position spaced apart from the photosensitive drum so as not to interfere therewith when the photosensitive drum unit is being mounted or dismounted. The pre-erasing unit may further include an elastic member to provide elasticity in a direction in which the pre-transfer erasing lens moves to the retracted position.
Description
Technical field
The application relates to a kind of electrophotographic printer, relates more particularly to a kind of electrophotographic printer of printing based on multiple tracks (multi-pass).
Background technology
Usually, electrophotographic printer is by being filled with radiation laser beam formation electrostatic latent image on the photosensitive medium of predetermined potential, use has the described electrostatic latent image of toner development of predetermined coloured image to form toner image, described toner image is delivered on the recording medium and with its fusion on recording medium, and then print monochrome or multicolor image.
Electrophotographic printer typically is divided into Wet-type electrophotographic printer and dry type electrophotographic printer according to employed developer.The Wet-type electrophotographic printer uses has the developer that is dispersed in the Powdered toner in the liquid-carrier.Dry type electrophotographic printer uses has the double component developing of the powder carrier that mixes mutually with a kind of toner, or does not have the single component developing agent of carrier.Above-mentioned dry type electrophotographic printer will be described now, and a kind of toner represented in employed term " developer " for easy purpose in full.
The printing of coloured image needs yellow (Y), carmetta (M), cyan (C) and black (K) toner usually.Correspondingly, need be used for developing four developing cells of corresponding toner.Need the single track of four exposing units and a photosensitive medium to print, or need the multiple tracks of a single exposing unit and a photosensitive medium to print, may be used to the printing color image.In any case, four developing cells are necessary.
Because in monochrome image printing and two kinds of situations of color print image, finish printing,, prints and color print image the single track Method of printing so allowing to finish monochrome image quickly than the multiple tracks printing in the single track mode.On the other hand, although the multiple tracks Method of printing needs four times or more multilemgth time than monochromatic the printing aspect color print image, it can be achieved by the structure of simplifying.
Summary of the invention
The invention provides a kind of dry type electrophotographic printer of printing based on multiple tracks, it is configured to and can prevents photosensitive medium because the caused damage of interference between photosensitive medium and the pre-transfer eraser (pre-transfer eraser) in the process of the disposable of installation or removal such as photosensitive medium, developing apparatus or offset medium.
The partly explanation hereinafter of other purposes of the present invention and advantage, and partly become clear by explanation, or recognized by the invention process.
According to an aspect of the present invention, provide a kind of electrophotographic printer, it comprises: the photosensitive drums that is formed with electrostatic latent image thereon; At least one has by toner being applied to the developing cell of the developer roll that forms toner image on the electrostatic latent image; And pre-transfer eraser, it is by removing light beam irradiates on the photosensitive drums the electric charge of photosensitive drums non-image areas after toner image develops, what wherein pre-erase unit comprised irradiates light wipes lamp in advance, and pre-transfer is wiped the pre-transfer that light that lamp sends guides to photosensitive drums wipe lens, this pre-transfer is wiped lens and is installed movably and make it be movable to pre-transfer to wipe lens near the erasure location of photosensitive drums to realize wiping, and with the isolated retracted position of photosensitive drums so that install or during the removal photoconductive drum unit and its do not produce interference.
Description of drawings
These and other purposes of the present invention will be from being more readily understood below in conjunction with becoming clear the explanation of accompanying drawing to embodiment, among the figure:
Fig. 1 is the synoptic diagram of electrophotographic printer according to an embodiment of the invention;
Fig. 2 is the decomposition diagram of electrophotographic printer shown in Fig. 1;
Fig. 3 is the sectional view of electrophotographic printer shown in Fig. 2 along the intercepting of I-I ' line;
Fig. 4 is the skeleton view of developing apparatus shown in Fig. 2; And
Fig. 5 and 6 is the side view of pre-transfer erase unit shown in the key diagram 2;
Embodiment
With reference to embodiments of the invention, the example has been described in the accompanying drawings in detail, wherein identical Reference numeral is represented components identical in the whole text.Illustrate that below with reference to the accompanying drawings embodiment is in order to explain the present invention.
Fig. 1 is the synoptic diagram of electrophotographic printer according to an embodiment of the invention.
With reference to Fig. 1, comprise photosensitive drums 1, charging roller 2,3, four developing cells 4 of exposing unit and transfer belt 5 according to the electrophotographic printer of this embodiment.
Described photosensitive drums 1 can be the cylindrical metal drum, is formed with photographic layer on its external peripheral surface.
Charging roller 2 is the chargers that evenly charge for photosensitive drums 1.When the external peripheral surface with respect to photosensitive drums 1 rotated with contact or non-contacting mode, described charging roller 2 provided electric charge for photosensitive drums 1, and then makes the external peripheral surface of photosensitive drums 1 have uniform electromotive force.The corona discharger (not shown) can be used as a kind of replacement charger of charging roller 2.
Exposing unit 3 can be arranged on photosensitive drums 1 below, and will with the corresponding light beam irradiates of image information on the photosensitive drums 1 of uniform charging, and then on photosensitive drums 1, form electrostatic latent image.Use laser diode to be used as exposing unit 3 usually as the laser scan unit (LSU) of light source.
Four developing cell 4C, 4M, 4Y and 4K comprise cyan (C), carmetta (M), yellow (Y) and black (K) solid, powdery toner respectively, and each developing cell 4C, 4M, 4Y and 4K comprise developer roll 25, are formed on the electrostatic latent image on the photosensitive drums 1 and form toner image so that corresponding toner is offered.Described four developing cell 4C, 4M, 4Y and 4K can be configured to make the spaced apart developing gap Dg of external peripheral surface of developer roll 25 and photosensitive drums 1.Described developing gap Dg is preferably tens to the hundreds of micron.
Order is formed on that cyan (C) on the photosensitive drums 1, carmetta (M), yellow (Y) and black (K) toner image are transferred on the transfer belt 5 successively and is overlapped, and then formation multi-color toner image.The linear operation speed of transfer belt 5 can be identical with the linear turning rate of photosensitive drums 1.The length of transfer belt 5 should be identical or longer with the length of paper (S) (or other recording mediums), wherein will finally form the multi-color toner image on this paper.
Reference numeral 6 expressions first cleaning device, it is used for after toner image is transferred to transfer belt 5, removes the unnecessary toner that remains on photosensitive drums 1 external peripheral surface.The used toner of being collected by first cleaning device 6 is stored in the used toner storage container (not shown).
Lamp is wiped in Reference numeral 7 expressions.The described lamp 7 of wiping is a kind of eraser, and it wiped the electric charge that remains on photosensitive drums 1 external peripheral surface before charging.The described lamp 7 of wiping is mapped to the illumination of scheduled volume the external peripheral surface of photosensitive drums 1 and wipes the electric charge that remains on the photosensitive drums 1.
After being illustrated in and printing, Reference numeral 17 sends the distributing roller of paper S.Paper transmission unit 20 is included in the feed path 21 of guiding paper S between paper feed roller 16 and the fixing device 11, and the dual path 22 that printing is provided.
The paper S that has the image printed and transmit by described fixing device 11 on its one side, 19 are discharged by distributing roller 17 (17a and 17b) through the path.For duplex printing, distributing roller 17 19 is sent to dual path 22 with the rotation of opposite direction and described paper S from the path.Then, described paper S is inverted so that print on its another side.The paper S that is inverted is transmitted by paper feed roller 16 via feed path 21 once more and finish printing on the another side of described paper S.
Explanation now uses the image of the electrophotographic printer of above-mentioned structure to form operation.
Multicolor image forms the message segment that comprises about cyan (C), carmetta (M), yellow (Y) and black (K).In aspect of present embodiment, cyan (C), carmetta (M), yellow (Y) and black (K) toner image are overlapping with this order on transfer belt 5, and are transferred to subsequently on the paper being fixed on the paper, and then the formation multicolor image.Should be noted that toner image is overlapping with other orders alternatively, it is for realizing intended purposes disclosed here and/or feature.
The external peripheral surface of photosensitive drums is recharged roller 2 and charges equably.If when being radiated on the photosensitive drums 1 of rotating corresponding to the optical signals exposing unit 3 of cyan (C) image information, the impedance of light signal illuminated portion be lowered and photosensitive drums 1 external peripheral surface on electric charge disappear.Therefore, it is poor to have produced static between the part of light signal irradiation and non-irradiated part, and then forms electrostatic latent image on the external peripheral surface of photosensitive drums 1.
When photosensitive drums 1 rotation made electrostatic latent image near cyan developing cell 4C, the developer roll 25 of cyan developing cell 4C began rotation.Subsequently, applying development from power supply 8 is biased on the developer roll 25 of cyan developing cell 4C.Simultaneously, the developer roll 25 to other developing cells 4M, 4Y and 4K applies the prevention bias voltage that develops.Afterwards, have only cyan toner to stride across developing gap Dg and adhere on the electrostatic latent image that forms on the external peripheral surface of photosensitive drums 1, therefore formed the cyan toner image.
When photosensitive drums 1 rotation made the cyan toner image near transfer belt 5, described cyan toner image was transferred on the transfer belt 5 by the contact pressure between first transfer bias and/or photosensitive drums 1 and the transfer belt 5.
After cyan toner was transferred to transfer belt 5 fully, carmetta (M), yellow (Y) and black (K) toner image were overlapping by above-mentioned operation on transfer belt 5.
In above-mentioned operation, transfer roll 12 is spaced apart with transfer belt 5.If four kinds of toner images all are transferred on the transfer belt 5 and are overlapping thereon, on transfer belt 5, form the multi-color toner image so, described transfer roll 12 contacts so that the multi-color toner image is transferred on the paper S with transfer belt 5.
Paper S is provided by paper feeding cassette 12a, the second paper feeding cassette 13b or MPF13c, and when making the leading edge of the multi-color toner image on being formed at transfer belt 5 arrive contact point, the leading edge of paper arrives the contact point of transfer belt 5 and transfer roll 12.If paper S passes through between transfer belt 5 and transfer roll 12, by second transfer bias multi-color toner image is transferred on the paper S, and pass through fixing device 11 and utilize heat and pressure fixing on paper S, have photographic fixing the multi-color toner image paper S so that be sent by path 19, and then finish the formation of coloured image.
For print job subsequently, first and second cleaning devices 6 and 9 can remove the used toner that remains on photosensitive drums 1 and the transfer belt 5 respectively, and wipe lamp 7 and can light shine on the photosensitive drums 1 to remove remaining electric charge on the photosensitive drums 1.
Fig. 2 is the decomposition diagram of electrophotographic printer shown in Fig. 1, and Fig. 3 is the sectional view of electrophotographic printer shown in Fig. 2 along the intercepting of I-I ' line.
With reference to Fig. 2, the photoconductive drum unit 200 with photosensitive drums 1, four developing cell 4C, 4M, 4Y and 4K having the intermediate transfer unit 300 of transfer belt 5 and have developer roll 25 respectively are installed on main frame 100.
Vertically Z installs or removal photoconductive drum unit 200.Described intermediate transfer unit 300 can be arranged on the above-mentioned photoconductive drum unit 200, and also vertically Z installed and removal.Described developing cell 4C, 4M, 4Y and 4K install slidably so that it can be installed on the side of photosensitive drums 1 or removal from it with horizontal direction X.In this illustrative example, described developing cell 4C, 4M, 4Y and 4K are arranged so that described cyan developing cell 4C, carmetta developing cell 4M, yellow developing cell 4Y and black developing cell 4K are upwards settled from the bottom in proper order with this order.Yet, alternately, developing cell 4C, 4M, 4Y and 4K being set with other random orders, this also can be implemented in this disclosed intended purposes and/or feature.Pre-transfer eraser 10 can be arranged on the top of the developing cell 4K of the top.Described exposing unit 3 and wipe the below that lamp 7 can be arranged on photoconductive drum unit 200.Reference numeral 400 expression is used for the used toner storage container of the used toner that produced during the storage print.Described useless toning utmost point storage container 400 so is provided with and makes it vertically be arranged on the main frame 100 or removal from it along photosensitive drums 1.Although not shown, in view of described photoconductive drum unit 200, described paper transfer 20 can rotatably be placed on the opposite side of electrophotographic printer with respect to developing cell 4C, 4M, 4Y and 4K.
With reference to Fig. 3, main frame 100 comprises first guide rail 110, second guide rail 120 and the 3rd guide rail 130.Described first guide rail 110 can vertically Z-shaped as shown in Figure 3 one-tenth, makes that described photoconductive drum unit 200 can be vertically disposed thereon.Described second guide rail 120 can downward-slopingly make that intermediate transfer unit 300 can be disposed thereon.Described the 3rd guide rail 130 (130C, 130M, 130Y, 130K) along continuous straight runs X-shaped becomes, and makes developing cell 4C, 4M, 4Y and 4K be slidably disposed on it.Although not shown, described first to the 3rd guide rail 110,120 and 130 can be arranged on each opposite side of main frame 100 in couples, and every pair of guide rail toward each other.Reference numeral 112 expression is used for photoconductive drum unit 200 is fixed on fixed cell on the main frame 100, when photoconductive drum unit 200 is set up on it fully, and fixed cell rotation and arrive the position shown in the dotted line.
Fig. 4 is the skeleton view of developing cell shown in Fig. 2.
With reference to Fig. 4, described developing apparatus comprises four developing cell 4C, 4M, 4Y and 4K.Comprise cyan (C), carmetta (M), yellow (Y) and black (K) toner among described developing cell 4C, 4M, 4Y and the 4K respectively.Each developing cell 4C, 4M, 4Y and 4K have a developer roll 25, and its toner that is used for that developing cell is comprised offers described photosensitive drums 1.
Be inserted into the both sides that first support unit 31 in the 3rd guide rail 130 and second support unit 32 are set at each developing cell 4C, 4M, 4Y and 4K.In the embodiment shown in fig. 4, described first support unit 31 and second support unit 32 can be the boss (boss) from the side surface protrusion of each developing cell 4C, 4M, 4Y and 4K, so that it can be inserted in the 3rd guide rail 130.As shown in Figure 3, the 3rd support unit 31 and the 4th support unit 32 are inserted into and make developing cell 4C, 4M, 4Y and 4K be slided by 130 guiding of the 3rd guide rail and along continuous straight runs X in the 3rd guide rail 130, so that be fixed on subsequently on the main frame 100.
In corresponding developing cell 4C, 4M, 4Y and 4K, positioning unit is set,, keeps the clearance D g between developer roll 25 and the photosensitive drums 1 so that when developing cell 4C, 4M, 4Y and 4K are fixed on the framework 100.In the illustrative embodiment of Fig. 4, sleeve pipe 33 can be used as positioning unit and be installed on the either side of developer roll 25.The radius of the radius ratio developer roll 25 of described sleeve pipe 33 is equivalent to the size of developing gap Dg greatly.Therefore, each developing cell 4C, 4M, 4Y and 4K can slide along the 3rd guide rail, and contact with the external peripheral surface of photosensitive drums 1 and stop during the spaced apart developing gap Dg of developer roll 25 and photosensitive drums 1 when sleeve pipe 33.
With reference to Fig. 2 to 4, described photoconductive drum unit 200 and intermediate transfer unit 200 vertically Z are arranged on the main frame 100 and removal from it, and developing cell 4C, 4M, 4Y and 4K can along continuous straight runs X be arranged on the main frame 100 or removal from it.As mentioned above, developing cell 4C, 4M, 4Y and 4K are arranged to keep the developing gap Dg between photosensitive drums 1 and the developer roll 25.Therefore, as shown in Figure 1, developing cell 4C, 4M, 4Y and 4K can arrange around the mode of photosensitive drums 1 one sides according to them.Aspect of present embodiment, developing cell 4C, 4M, 4Y and 4K are mutually symmetrical in vertical direction.Since this specific arrangements of photosensitive drums 1, photoconductive drum unit 200 and intermediate transfer belt 300, an aspect of realization present embodiment, and promptly developing cell 4C, 4M, 4Y and 4K are set up in proper order with this.After should in developing cell 4Y and 4K at least are withdrawn into upwards extraction at development drum unit 200, not interfering the position of photosensitive drums 1, shift out described photoconductive drum unit 200.
Fig. 5 and 6 is the detailed side view of pre-transfer eraser 10 shown in Fig. 2.
Review Fig. 2, described pre-transfer eraser 10 is positioned at developing cell 4K top of the top and is fixedly installed on the main frame 100.For fear of vertically installing in photosensitive drums 1 or interfering during removal, described pre-transfer eraser 10 must be separated with the external peripheral surface of photosensitive drums 1 usually in the horizontal direction mutually.In such regular situation, the distance between pre-transfer eraser 10 and the photosensitive drums 1 can not obtain effectively to wipe too greatly.Therefore, according to the pre-transfer eraser 10 of present embodiment, as illustrated in Figures 5 and 6, comprise that pre-transfer is wiped lamp 41 and is used for that pre-transfer is wiped light beam that lamp 41 sent to be directed to photosensitive drums 1 lip-deep pre-transfer and to wipe lens 42.Described pre-transfer is wiped lens 42 and is installed movably, make it can move on to pre-transfer and wipe the erasure location that lens 42 and photosensitive drums 1 are close, thereby the guiding pre-transfer is wiped light that lamp 41 sent so that wiping of this place to be provided, and it can be moved to and photosensitive drums 1 isolated retracted position, so that be provided with or the described photoconductive drum unit 200 of removal.Can wipe lamp 41 along a plurality of described pre-transfer are set on the PCB43 that extends on photosensitive drums 1 length direction.Although not shown, described pre-transfer is wiped lamp 41 and can be installed in pre-transfer and wipe one or both ends place on the length direction of lens 42.
With reference to Fig. 5, support 44 can be arranged on the main frame 100, and has pre-transfer and wipe the PCB43 of lamp 41 and can be fixed on the support 44.Described pre-transfer is wiped lens 42 and be can be rotatably set on the support 44.Reference numeral 45 expressions are wiped the flexible member that lens 42 provide elastic force to pre-transfer, make pre-transfer wipe lens 42 along the direction rotation from photosensitive drums 1 withdrawal.
Can between development and transfer printing process, finish the pre-transfer erase process.Described pre-transfer eraser 10 can be between developing apparatus 4 and transfer belt 5.Described pre-transfer is wiped lens 42 and is rotated to erasure location and retracted position according to the installation of developing apparatus 4 with separating.As shown in the electrophotographic printer of illustrative embodiment, if a plurality of developing cell 4C, 4M, 4Y and 4K are provided, described pre-transfer is wiped lens and can be rotated with separating according to the installation near the developing cell 4K of transfer belt 5.Should be noted that to use and be provided at this disclosed intended purposes and or any developing cell of feature.
With reference to Fig. 6, when developing cell 4K indentation, described pre-transfer is wiped lens 42 can rotate to retracted position by the elastic force of flexible member 45.In this case, even photoconductive drum unit 200 is removed, pre-transfer wipes lens 42 and photosensitive drums 1 can not interfere with each other.If photoconductive drum unit 200 is set up and developing cell 4K along continuous straight runs when photoconductive drum unit 200 advances, the upper end of developing cell 4K and pre-transfer are wiped lens 42 interference and are made pre-transfer wipe lens 42 to rotate to erasure location.If developing cell 4K is installed fully, as shown in Figure 6, pre-transfer is wiped lens 42 can arrive erasure location in the face of photosensitive drums 1.If developing cell 4K is from the installation site indentation, described pre-transfer is wiped lens 42 can rotate to retracted position by the elastic force of flexible member 45.
Although this illustrative embodiment illustrates, photosensitive drums 1 can vertically be installed or removal, but the pre-transfer eraser 10 of present embodiment can be applied to unshowned such situation in the accompanying drawing, promptly photosensitive drums 1 along its length Y be mounted slidably or unload.In order to obtain to wipe, described pre-transfer is wiped lens 42 should be near the external peripheral surface of photosensitive drums 1.Therefore, in the situation of photosensitive drums 1 Y installation along its length or removal, prevent that a kind of method that photosensitive drums 1 is wiped lens 42 breaking-ups by pre-transfer from being pre-transfer to be wiped lens 42 separate with photosensitive drums 1.Equally,, illustrative embodiment installs or removal although but having illustrated developing cell 4K along continuous straight runs, even also can be configured at developing cell when the length direction Y of photosensitive drums 1 slides according to the described pre-transfer eraser 10 of present embodiment, pre-transfer wipe lens 42 also can by developing cell 4K and pre-transfer wipe between the lens 42 contact and the elastic force of flexible member 45 moves to erasure location and retracted position.
In illustrative embodiment, the electrophotographic printer of four developing cell 4C, 4M, 4Y and 4K with color image printing has been described.; the embodiment that has proposed is used to provide best illustration of the present invention and actual application aims thereof; for those of ordinary skills, in having the electrophotographic printer of single developing cell, utilize pre-transfer eraser according to the present invention to provide monochromatic print (although not shown) all can realize thus.
As mentioned above, in electrophotographic printer according to the present invention, because the installation of pre-transfer eraser and developing apparatus or removal move to erasure location and retracted position explicitly, when photosensitive drums installation or removal, can prevent the damage that causes by the pre-transfer eraser.
Although illustrated and illustrated several embodiments of the present invention, it will be understood by those skilled in the art that and under the prerequisite that does not break away from the principle of the invention and spirit, can make various improvement and be equal to replacement that scope of the present invention limits in appended claims.
Claims (13)
1. electrophotographic printer comprises:
Form the photosensitive drums of electrostatic latent image thereon;
At least one comprises the developing cell of developer roll, and described developer roll is by providing toner to form toner image to electrostatic latent image; With
The pre-transfer erase unit, it removes electric charge by light shining on the photosensitive drums from the non-image region of photosensitive drums after toner image develops, and described pre-transfer erase unit comprises:
Be used for luminous pre-transfer wipe lamp and
Pre-transfer is wiped the pre-transfer that light that lamp sends is directed to photosensitive drums wipe lens, this pre-transfer is wiped lens and is installed movably, make it can move to erasure location and retracted position, wherein at the erasure location place, pre-transfer is wiped lens and is provided and wipe near photosensitive drums, and at retracted position, pre-transfer wipe lens and photosensitive drums spaced apart so that install or do not interfere with it during removal at photoconductive drum unit.
2. electrophotographic printer according to claim 1, wherein said pre-transfer erase unit also comprises along pre-transfer wipes lens move to provides elastic force on the direction of retracted position flexible member, described pre-transfer is wiped lens and is contacted with developing cell when developing cell is installed, to move to erasure location subsequently, and when developing cell was drawn out of, pre-transfer was wiped lens and is turned back to retracted position by the elastic force of flexible member.
3. electrophotographic printer according to claim 1 and 2, wherein said photoconductive drum unit is vertically installed or removal, and described developing cell is installed or removal when along continuous straight runs slides.
4. electrophotographic printer according to claim 1, also comprise a plurality of developing cells that comprise the different colours toner, wherein the pre-transfer erase unit also comprises along pre-transfer and wipes lens move to provides elastic force on the retracted position direction flexible member, described pre-transfer is wiped lens and is contacted with in a plurality of developing cells at least one, so that move to erasure location subsequently, and described pre-transfer is wiped lens and is turned back to retracted position by the elastic force of flexible member when developing cell is drawn out of.
5. electrophotographic printer according to claim 4, also comprise the transfer belt that is positioned on the photosensitive drums, described toner image is transferred on this transfer belt, in described pre-transfer erase unit and a plurality of developing cells a developing cell near transfer belt contact so that move to erasure location.
6. electrophotographic printer according to claim 5, wherein said photosensitive drums is vertically installed or is removed.
7. electrophotographic printer according to claim 6, wherein a plurality of developing cells are installed or removal when along continuous straight runs slides.
8. electrophotographic printer according to claim 2, wherein said pre-transfer erase unit comprise also and are used for fixing the support that described pre-transfer is wiped lamp that this support is installed in the printer, is fixed with printed circuit board (PCB) on the described printer.
9. electrophotographic printer according to claim 8, wherein pre-transfer is wiped lens and is rotatably installed on the support.
10. electrophotographic printer according to claim 9, wherein when developing cell is installed in the printer, described developing cell causes pre-transfer to wipe lens rotating towards photosensitive drums, and from printer, during removal, make pre-transfer wipe lens and return from photosensitive drums by the elastic force of flexible member at developing cell.
11. electrophotographic printer according to claim 10, wherein said developing cell is installed in the printer with respect to the photosensitive drums along continuous straight runs.
12. an electrophotographic printer comprises:
Form the photosensitive drums of electrostatic latent image thereon;
At least one developing cell, it forms toner image on photosensitive drums; With
The pre-transfer erase unit, it removes electric charge by light shining on the photosensitive drums from the non-image region of photosensitive drums after toner image develops, described pre-transfer erase unit can move on to the light that will be shone and be directed to the primary importance of photosensitive drums to wipe, and is mounted or can moves on to the second place of separating mutually with photosensitive drums during removal in photosensitive drums.
13. electrophotographic printer according to claim 12, the response of wherein said pre-transfer erase unit is installed at least one developing cell in the printer and moves to primary importance, and response is with developing cell removal and move to the second place from printer.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR45394/03 | 2003-07-04 | ||
| KR45394/2003 | 2003-07-04 | ||
| KR1020030045394A KR100547131B1 (en) | 2003-07-04 | 2003-07-04 | Electrophotographic printer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1577154A CN1577154A (en) | 2005-02-09 |
| CN100383682C true CN100383682C (en) | 2008-04-23 |
Family
ID=33550290
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100621446A Expired - Fee Related CN100383682C (en) | 2003-07-04 | 2004-07-02 | Electrophotographic printer |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US7082281B2 (en) |
| JP (1) | JP4562438B2 (en) |
| KR (1) | KR100547131B1 (en) |
| CN (1) | CN100383682C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1674948B1 (en) * | 2004-12-27 | 2018-08-01 | Brother Kogyo Kabushiki Kaisha | Image forming apparatus |
| JP4829072B2 (en) * | 2006-01-27 | 2011-11-30 | 京セラ株式会社 | Image forming apparatus |
| US7742717B2 (en) † | 2007-09-11 | 2010-06-22 | Samsung Electronics Co., Ltd. | Developing device, memory unit thereof, and image forming apparatus |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4615605A (en) * | 1984-02-14 | 1986-10-07 | Sharp Kabushiki Kaisha | Separation mechanism of developing device from photoreceptor in dividing electrophotographic copying machine into two sections |
| US4864364A (en) * | 1986-12-27 | 1989-09-05 | Minolta Camera Kabushiki Kaisha | Charge eraser for an electrophotographic copier |
| JPH11227255A (en) * | 1998-02-19 | 1999-08-24 | Sanyo Electric Co Ltd | Image forming apparatus |
| JP2000098836A (en) * | 1998-09-24 | 2000-04-07 | Sanyo Electric Co Ltd | Led eraser and image forming device |
| CN1360234A (en) * | 2000-12-21 | 2002-07-24 | 佳能株式会社 | Image forming device and processing cassette mounted on same removably |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0188970U (en) * | 1987-08-18 | 1989-06-12 | ||
| JPH0295363U (en) * | 1989-01-18 | 1990-07-30 | ||
| JPH0741022Y2 (en) * | 1989-01-24 | 1995-09-20 | カシオ計算機株式会社 | Image forming device |
| JPH06110261A (en) * | 1992-09-25 | 1994-04-22 | Ricoh Co Ltd | Color image forming device |
| JPH0895396A (en) * | 1994-09-29 | 1996-04-12 | Ricoh Co Ltd | Image forming method and device applying same |
| JPH10149078A (en) * | 1996-11-21 | 1998-06-02 | Hitachi Ltd | Electrophotographic device |
| JP2000105493A (en) * | 1998-09-30 | 2000-04-11 | Ricoh Co Ltd | Image forming device |
| JP2001282075A (en) * | 2000-03-28 | 2001-10-12 | Brother Ind Ltd | Belt cartridge and method for exchanging endless belt- shaped image carrying means using the cartridge |
| US6356726B1 (en) * | 2000-06-15 | 2002-03-12 | Lexmark International, Inc. | Electrophotographic printer with compact pre-transfer erase assembly |
| KR100433538B1 (en) * | 2002-02-06 | 2004-05-31 | 삼성전자주식회사 | Apparatus for forming color image using electrophotography |
-
2003
- 2003-07-04 KR KR1020030045394A patent/KR100547131B1/en active IP Right Grant
-
2004
- 2004-04-12 US US10/821,994 patent/US7082281B2/en not_active Expired - Lifetime
- 2004-07-02 CN CNB2004100621446A patent/CN100383682C/en not_active Expired - Fee Related
- 2004-07-05 JP JP2004198293A patent/JP4562438B2/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4615605A (en) * | 1984-02-14 | 1986-10-07 | Sharp Kabushiki Kaisha | Separation mechanism of developing device from photoreceptor in dividing electrophotographic copying machine into two sections |
| US4864364A (en) * | 1986-12-27 | 1989-09-05 | Minolta Camera Kabushiki Kaisha | Charge eraser for an electrophotographic copier |
| JPH11227255A (en) * | 1998-02-19 | 1999-08-24 | Sanyo Electric Co Ltd | Image forming apparatus |
| JP2000098836A (en) * | 1998-09-24 | 2000-04-07 | Sanyo Electric Co Ltd | Led eraser and image forming device |
| CN1360234A (en) * | 2000-12-21 | 2002-07-24 | 佳能株式会社 | Image forming device and processing cassette mounted on same removably |
Also Published As
| Publication number | Publication date |
|---|---|
| US7082281B2 (en) | 2006-07-25 |
| KR20050003878A (en) | 2005-01-12 |
| KR100547131B1 (en) | 2006-01-26 |
| JP4562438B2 (en) | 2010-10-13 |
| US20050002691A1 (en) | 2005-01-06 |
| JP2005031674A (en) | 2005-02-03 |
| CN1577154A (en) | 2005-02-09 |
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